Mercedes finally hit the front in 2015 pre-season testing on Friday, as Nico Rosberg set an imperious new benchmark on day two in Barcelona.Elsewhere there was encouragement for McLaren, as Jenson Button completed more than 100 laps on the team's most successful day to date, and Force India, who rolled out their new car for the first time and clocked up close to 80 laps across the afternoon.But it was Mercedes who stole the show. Despite being the early favourites given their dominance in 2014, the Silver Arrows had not troubled the top of the timesheets over the opening nine days of testing. That changed, however, as the team bolted on Pirelli's soft compound for the first time this year,...
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